[exim] separate log file for deliveries

Heya,

I'd like to make the log file a bit more comprehensible. In mainlog,
all contents of rejectlog are printed, along with all successful
deliveries. I'd like to have all successful deliveries, lines like
these:

2006-11-20 12:58:54 1Gm7nX-0002Wz-EP <= [cut for brevity]
2006-11-20 12:58:54 1Gm7nX-0002Wz-EP => sthalik [same here]

in a separate log file.

While reading the spec file, I haven't found any mention of creating
custom log files, as opposed to mainlog, rejectlog and paniclog. Is such
a thing possible right now?

/sh